Hi,thank you for your reply! The "width of the signal" is the modulation signal that I want the DA to output. The signal consists different amplitude square signals,and likes modulation of the sine signal and square signal.

I need 8 channels of the modulation signals, and the delay time of the any two-way signals of 6 channels should not exceed 20ns. Now I'm finding the method to acheive it.

Thank you for your reply. First, I'm very sure I need to creat pulses going from 2V to a certain value, then back to 2V. Second, the fastest update period of AD5676R is around 870nS and I think it doesn't satisfy 500ns's width of the pulse .

If I use AD9784 and a amplifier,what do you think? Can you help me choose a amplifier?

Can you give me some suggestions?? I'm going to use AD9748 and ad8048 to complete the design,but Iam not sure about it .And to fullfill the 4v amplitude ,I need to use ad8048 to get the gain of about 10. Iam not sure.

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